Can we initialize unordered_map as global variable in c++?

Question

I am trying to initialize unordered_map as global vairbale in c++ , but it is giving me error as my variable doesnot name a type when I do mp[0]='a'. How can we initialize unordered_map as an global variable in c++?
https://code.sololearn.com/cwMg6mQpnn0L/?ref=app

Answer 1

The unordered_map can be declared as a global variable (or in this case, a global object), but the subsequent assignment steps has to happen within a function (as you are not declaring anything but rather assigning to an existing object). If this is not possible, just provide the values via constructor.

unordered_map<int, char> mp{{0,'a'},{1,'b'}};

Answer 2

yes we can, just declare unordered_map<whatever,whatever> map globally and for setting of parameters or data just make a funcion and call it.
by this we can setting and using map as globally.
ex-> unordered_map<string,pair<int,int>> um;

->make functions for setting data
void f1(){
um["r"]={0,1};
um["l"]={0,-1};
um["u"]={-1,0};
um["d"]={1,0};

}
->using 1 time function call we can set data
fun();

->NOW YOU ARE READY TO USE YOUR MAP